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应用B超和磁共振对84例脑肿瘤患者进行视神经直径测量，分别计算在不同脑压、不同部位、不同肿瘤性质及不同病程时脑肿瘤的视乳头水肿及视经束增宽的发生率，探讨视神经增宽对脑肿瘤的早期诊断价值。结果示84例脑瘤患者视乳头水肿的发生率为68％，B超和磁共振测量视神经增宽的发生率为83％和89％（与视乳头水肿相比，P＜0．05）。当脑压在1．97～2．50kPa、肿瘤为胶质瘤、肿瘤位于大脑半球及病程较短时，视神经增宽的发生率明显高于视乳头水肿的发生率（P＜0．05）。结论：B超和磁共振测量视神经直径均能提高脑瘤的早期诊断，但B超操作方便、精确性强、经济有效，应为首选。
B-ultrasonography and magnetic resonance imaging were used to measure the optic nerve diameter in 84 patients with brain tumors. The incidences of optic disc edema and optic tract widening in brain tumors at different brain pressures, different sites, different tumor properties, and different course of disease were calculated. The early diagnosis value of optic nerve widening for brain tumors. The results showed that the incidence of optic disc edema was 68% in 84 cases of brain tumors, and the incidence of optic nerve widening in B-mode ultrasonography and magnetic resonance imaging was 83% and 89% (P<0.05 compared with optic disc edema). When the brain pressure was 1.97-2.50 kPa, the tumor was glioma, the tumor was located in the cerebral hemisphere and the course of the disease was shorter, the incidence of optic nerve widening was significantly higher than that of optic disc edema (P<0.05). Conclusion: B-ultrasonography and magnetic resonance imaging can improve the early diagnosis of brain tumors, but B-mode ultrasonography is convenient, accurate, and economical. It should be the first choice.